Is this something I should worry about?

Here is the SOOC jpg, it was processed in the Lightroom 4, the lens was 70-300vr.

I see six of the same lined up at the bottom of the exposure... getting bigger left to right. Largest falls on the smoke stack. Looks like there was grass or something in front of the lens when yo took the shot. Since it's not in the other shots...I assume you moved the car or moved the lens. Using a telephoto, we often don't notice close obstructions.